AD9775EB AD [Analog Devices], AD9775EB Datasheet - Page 9

• Manufacturer Part Number: AD9775EB
• Description: 14-Bit, 160 MSPS 2X/4X/8X Interpolating Dual TxDAC+ D/A Converter
• Manufacturer: AD [Analog Devices]

DEFINITIONS OF SPECIFICATIONS
Adjacent Channel Power Ratio (ACPR)
A ratio in dBc between the measured power within a channel
relative to its adjacent channel.
Complex Image Rejection
In a traditional two-part upconversion, two images are created
around the second IF frequency. These images are redundant
and have the effect of wasting transmitter power and system
bandwidth. By placing the real part of a second complex modu-
lator in series with the first complex modulator, either the upper
or lower frequency image near the second IF can be rejected.
Complex Modulation
The process of passing the real and imaginary components of a
signal through a complex modulator (transfer function = e
cos t + jsin t) and realizing real and imaginary components on
the modulator output.
Differential Nonlinearity (DNL)
DNL is the measure of the variation in analog value, normalized
to full scale, associated with a 1 LSB change in digital input code.
Gain Error
The difference between the actual and ideal output span. The
actual span is determined by the output when all inputs are set
to “1,” minus the output when all inputs are set to “0.”
Glitch Impulse
Asymmetrical switching times in a DAC give rise to undesired
output transients that are quantified by a glitch impulse. It is
specified as the net area of the glitch in pV
Group Delay
Number of input clocks between an impulse applied at the
device input and peak DAC output current. A half-band FIR
filter has constant group delay over its entire frequency range.
Impulse Response
Response of the device to an impulse applied to the input.
Interpolation Filter
If the digital inputs to the DAC are sampled at a multiple rate of
f
with a sharp transition band near f
typically appear around f
suppressed.
Linearity Error (Also Called Integral Nonlinearity or INL)
Linearity error is defined as the maximum deviation of the actual
analog output from the ideal output, determined by a straight
line drawn from zero to full scale.
REV. 0
DATA
(interpolation rate), a digital filter can be constructed
DAC
(output data rate) can be greatly
DATA
/2. Images that would
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.
j t
=
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Monotonicity
A D/A converter is monotonic if the output either increases
or remains constant as the digital input increases.
Offset Error
The deviation of the output current from the ideal of “0” is
called offset error. For I
inputs are all “0.” For I
inputs are set to “1.”
Output Compliance Range
The range of allowable voltage at the output of a current output
DAC. Operation beyond the maximum compliance limits may
cause either output stage saturation or breakdown, resulting in
nonlinear performance.
Pass Band
Frequency band in which any input applied therein passes
unattenuated to the DAC output.
Power Supply Rejection
The maximum change in the full-scale output as the supplies
are varied from minimum to maximum specified voltages.
Settling Time
The time required for the output to reach and remain within a
specified error band about its final value, measured from the
start of the output transition.
Signal-to-Noise Ratio (SNR)
SNR is the ratio of the rms value of the measured output signal
to the rms sum of all other spectral components below the
Nyquist frequency, excluding the first six harmonics and dc.
The value for SNR is expressed in decibels.
Spurious-Free Dynamic Range
The difference, in dB, between the rms amplitude of the output
signal and the peak spurious signal over the specified bandwidth.
Stop-Band Rejection
The amount of attenuation of a frequency outside the pass band
applied to the DAC, relative to a full-scale signal applied at the
DAC input within the pass band.
Temperature Drift
Temperature drift is specified as the maximum change from the
ambient (25°C) value to the value at either T
offset and gain drift, the drift is reported in ppm of full-scale
range (FSR) per °C. For reference drift, the drift is reported in
ppm per °C.
Total Harmonic Distortion (THD)
THD is the ratio of the rms sum of the first six harmonic com-
ponents to the rms value of the measured fundamental. It is
expressed as a percentage or in decibels (dB).
OUTB
OUTA
, 0 mA output is expected when all
, 0 mA output is expected when the
MIN
AD9775
or T
MAX
. For